I was having this issue with my game as well. This is the video I watched that fixed it for me: (Just so you know though, this video is about the Event System. Basically the idea is that in your main menu scene, you have an event system, but in your next scene, you forget to add an event system. I'm not entirely sure if you're saying that you already have an event system in each scene but just in case here's this video. )